When I go to work my maid puts on my androidtv and watches all sorts of sleazy things on youtube and i know this because youtube has started suggesting a lot of dirty stuff!!!
Please suggest some sort of an applocker or a lockscreen or even wifi disabler cause ive been breaking my head over this..
https://support.google.com/androidtv/answer/6123330?hl=en
Although i have no idea how to automatically turn it on, so you don't have to do it every time.
i'm pretty sure you can set up restrictions on your router. That would be a much better solution, since you can set a time-range when the device have internet access.